module.exports = {
    // create by mongodb automatic (24 [a-f0-9] chars)
    _id: { sample:"_12345134", alias:"ID", description:""},
    // behavior is invalid, true when it's just created
    _invalid: { sample:undefined, alias:"非法", description:""},
    // behavior occur time
    t : { sample:1551333801530, alias:'发生时间', description:'date.getTime()'},
    // behavior ip
    ip : { sample:"127.0.0.1", alias:"IP", description:""},
    // behavior ip
    user_id : { sample:"5c46d2b0eb4eed8d8f10603c", alias:"用户ID", description:""},
    // behavior access
    url : { sample:"/zoo/pig.html?123", alias:"访问地址", description:""},
    // behavior param, it is old-ip when rebind session, it is user_id when signin/signout, it is article_id when publish/edit article, it is comment_id when comment
    param : { sample:"5c46d2b0eb4eed8d8f10603c", alias:"访问参数", description:""}
};